Highlights
- The West Phoenix air monitoring station recorded ozone at 72.0 PPB at 11 p.m. Saturday, Aug. 8.
- That reading crossed AirNow's unhealthy-for-sensitive-groups threshold for ozone.
- Maricopa County Air Quality Department operates the station; current forecasts and active alerts are posted at AirNow's Phoenix page.
The West Phoenix air monitoring station (AQS site ID 040130019) recorded ozone at 72.0 PPB at 11 p.m. Saturday, Aug. 8, crossing the EPA AirNow threshold designated unhealthy for sensitive groups, according to the EPA AirNow public hourly aggregate reported by the Maricopa County Air Quality Department.
Other pollutants measured at the same station and hour: carbon monoxide at 0.2 PPM, nitrogen dioxide at 3.0 PPB, PM10 at 21.0 micrograms per cubic meter, and PM2.5 at 9.4 micrograms per cubic meter. None of those readings triggered a threshold crossing.
For current forecast conditions and any active advisories, Maricopa County Air Quality Department maintains a rapid-response notification system for residents who want email or text alerts when pollution levels rise at selected monitoring locations. The AirNow Phoenix page is updated hourly.
Sources
Every factual claim in this article traces to one of the sources below. See how we work for the editorial process.
- 040130019 retrieved 09/08/2026 00:45
- Maricopa County retrieved 09/08/2026 00:45
Authored by The Scottsdale Signal. Drafted by AI from primary-source material under our beat-specific editorial guides; reviewed by humans before publish under our five-gate process. Sources retrieved at 09/08/2026 00:45. Every claim traces to a source.
